In total, six germ cell tumor cell lines (seminoma: TCam‐2; EC: 2102EP, NCCIT; CC: JAR, JEG‐3; YST: GCT72; EC‐YST‐intermediate: 1411H) and five TM cell lines (fibroblasts: MPAF, HVHF2; MIL4/IL13 macrophages: THP‐1 polarized into MIL4/IL13 macrophages; T‐lymphocytes: JURKAT; endothelial cells: HUVEC) have been included in this study (Fig. 1B). Here, IL13 is linked to germ cell tumor.